Resurfacing device for surface grinding machines



March 12, 1935.. T. H. DARDANl RESURFACING DEVICE FOR SURFACE GRINDING MACHINES Filed Feb. 15, 1935 4 Sheets-Sheet 1 III: III! u|| 1m m Hill I II [III INVENTOR. /7 Dd/"0 n A TTORNEY.

March 12, 1935. T. H. DARDANI RESURFACING DEVICE FOR SURFACE GRINDING MACHINES Filed Feb. 15, 1933 4 Sheets-Sheet 2 INVENTORI mama 5 7 .Darda in A TTORNEY.

March 12, 1935. DARDAM 1,994,386

RESURFACING DEVICE FOR SURFACE GRINDING MACHINES Filed Feb. 15, 1933 4 Sheets-Sheet 5 IN V EN TOR.

fioma n s 6 DaroZa/n' A TTORNEY.

March 12, 1935. T. H. DARDANI 1,994,336

RESURFACING DEVICE FOR SURFACE GRINDING MACHINES 4 Shegfcs-Shegt 4 Filed Feb. 15, 1953 IN V EN TOR. 720m Dinidv 1' BY ATTORNEY.

Patented Mar. 12, 1935 PATENT OFFICE RESURFACING DEVICE FOR SURFACE Q GRINDING MACHINES Thomas H. Dardani, Bloomfield, N. J. Application February 15, 1933, Serial No. 656,897

4 Claims.

The present invention relates to a resurfacing device for surface grinding wheels, and has for an object to provide a device of this character by means of which an exact predetermined grinding Ii surface may be produced upon an abrasive grinding wheel with precision and facility, particularly where the surface is of a complicated or irregular shape including radial and angular faces.

Heretofore resurfacing devices have usually been in the nature of an attachment which was removably mounted on the work bed of the grinding machine, necessitating removal of the work and mounting and removing the resurfacing device each time the grinding wheel must be resurfaced. This was not only inconvenient and time consuming but resulted in variations and inaccuracies which could only be corrected by very skillful and laborious adjustment.

It is proposed in the present invention to provide a resurfacing device which will form a permanent part of the grinding machine, and which may be brought into operative position quickly and easily without the necessity for disturbing or removing the work, and which in its operative position will be arranged to permit the operator to work in the most eflicient manner, both from the standpoint of manipulation of the device and sighting the work, and which in the inoperative 30 position will be entirely out of the way of interference with the normal work of the grinding machine.

It is a further object to provide a resurfacing device which will accurately form radii and angles in any desired degrees and minutes and will blend the radial and angular surfaces into each other without perceptable divisions, and which will further permit of recording of any particular grinding operation and exact reproduction of such operation asmany times as may be desired. Another object is to provide a resurfacing device in which the diamond resurfacing point may be bodiment of the invention, the same being shown in operative relation to the periphery of the grinding wheel, the latter being indicated by dot-and-dash lines.

Fig. 2 is a vertical sectional view, taken along the line 2-2 of Fig. 1. p I

Fig. 3 is a perspective view of a surface grinding machine of standard type, showing the resurfacing device of the present invention mounted thereon.

Fig. 4 is a perspective view of the surface grindingmachine and showing the resurfacing device in a modified operative arrangement thereon.

Fig. 5 is an end elevation of the resurfacing device.

Fig. 6 is a plan view partially in horizontal section.

Fig. 7 is a plan view, partially broken away, and showing a different position of adjustment from that shown in Fig. 6.

Fig. 8 is a sectional view of the edge of an abrasive grinding wheel of the type adapted to be resurfaced by the present device.

Similar reference characters indicate corresponding parts throughout the several figures of the drawings.

Referring to the drawings, the resurfacing device, according to the illustrated exemplary embodiment of the invention, is adapted to be mounted on the front face of the upright standard 10 of the grinding machine, which for this purpose is provided with a horizontally disposed slide block 11 secured by bolts 12 and having beveled upper and lower slide surfaces. The supporting arm or bracket 13 is provided with an adjustable mounting base 14 having a dove-tail recess 15 slidably engaging the block 11, a gib block 16 being disposed between the upper surfaces of the recess and block and adjustable as to pressure by aseries of set screws 17. A pocket 18 is provided longitudinally of the base and within the recess 15 in which an adjustment screw shaft 19 is disposed and engaged in the threaded passage'of a projection 20 formed on the slide block 11, one end of the screw shaft being journaled for rotary movement in a thrust bearing 21 provided in the end of the base 14. A hand wheel 22 is secured upon the end of the screw shaft which upon being turned is adapted to adjust the bracket longitudinally of the slide block. A pointer 23 is provided at the upper side of the bracket and moves in relation to 'a calibrated scale 24 provided on the standard 10, the zero position as indicated in Fig. 1 being in the vertical plane of the axis of rotation of the grinding wheel.

The bracket arm 13 is provided with a flat horizontally disposed mounting head 25 of circular outline, having a centrally disposed bolt hole 26 therein and provided at its under side with a circular positioning boss or platform 27 concentric to the hole-26 and having a tapered periphery 28. A pivot block 29, of rectangular outline is provided in its upper surface with a circular tapered wall recess .30 engaged by the circular boss 27 of the head 25, a central threaded hole 31 being provided in the block into which is screwed the retaining bolt 32, adapted when tightened 'to secure the block to the head and when loosened to permit of angular adjustment within a range of 90 in either direction from the zero position indicated in Fig. 6. A pointer 33 is secured to the block 39 in relation to calibrations 34'on the periphery of the head 25. Fig. 7 illustrates the adjustment of the block to a position 45 removed in one direction from that shown in Fig. 6. This adjustment is clamped solid during operation of the device.

Within the under side of the block 29 there is provided a dovetail slideway recess 35, in which is engaged a dovetail slide rib 36 provided on the upper side of a slide block 37, a gib strip 38 being disposed between the inclined faces of the recess and rib at one side which is adapted to be tightened against the rib by means of a pair of set screws 39 and 40 provided in the block 29 to fix the position of the slide block 37. A longitudinal pocket 41 is provided in the block 29 within the recess in which is disposed an adjustment screw shaft 42 engaging the threaded passage of a projecting boss 43 on the rib 36 of the slide block 37, the end of the screw shaft being joumaled in abearing portion 44 at the forward end of the pocket 41 and held against longitudinal movement by a thrust collar 45, the outer projected end of the shaft'having a cap 46 secured thereon by a pin 47, and provided with a squared projecting end portion 48 for engagement by a crank handle 49, indicated by dot-and-dash lines in Fig. 1. Turning of the shaft 42 imparts longitudinal movement to the slide block 37, such movement being permitted when the set screws 39 and 40 are loosened. A pointer 50 is secured upon the block 29 in relation to calibration 51 on the cap 46.

A 1 -slot 52 is provided in the opposite side of the block 29 from the set screws 39 and 40, and has a pair of stop blocks 53 and 54 adjustably secured therein by means of slide bolts 55 and 56. A calibrated scale 57 is provided upon the block 29 longitudinally below the slot 52 and in relation to a pointer 58 secured to the slide block 37, this pointer being at the zero position when the slide 37 is aligned at its ends with the block 29. The stop blocks are angularly recessed as at 59 and 60 at their opposed faces, the depth of each of these recesses being half the width of the pointer 58, so that when brought together to a position of adjustment at zero they will meet at the zero marking and abut the pointer at each side to thereby prevent any movement of the slide.

From the zero position the limit of movement in either direction may be accurately predetermined by adjustment of the blocks at the desired predetermined points.

Within the base of the slide block 37 and disposed in right angular relation to the slide rib 36 there is'provided a dovetail slideway recess 61, in which is engaged a dovetail slide rib 62 secured in a shallow recess 63 at the upper side of a slide block 64 by means of counter-sunk screws 65. A gib strip 66 is disposed between the inclined faces of the recess and rib at one side and is adapted to be tightened against the rib by means of a pair of set screws 67 and 68 provided in the block 37 to fix the position of the slide block. A longitudinal pocket 69 is provided in the block 37 within the recess 61, in which'is disposed an adjustment screw shaft 70 engaging the threaded passage of a projecting boss 71 on the rib 62, the end of the screw shaft being journaled in a bearing portion 72 at the outer end of the pocket 69 and held against longitudinal movement by a thrust collar 73, the outer projected end of the shaft having a cap 74 secured thereon by a pin 75 and provided with a squared projecting end.

portion 76 for engagement by the crank-handle 49. Turning of the shaft 70 imparts movement therein by means of slide bolts 82 and 83; A calibrated scale 84 is provided in the block 37 longitudinally below the slot 79 and in relation to a pointer block 85 secured upon the slide block 64 by a screw 86, and provided with a beveled pointer face 87 having an indicator line disposed in indicating relation to the calibration 84. The stop blocks 80 and 81 are angularly recessed, as at 88 and 89, at their opposed faces, the depth of these recesses being half the width of the pointer 85, so that when brought together to meeting position they will abut the pointer at each side,- preventing any movement of the slide. From the zero position shown in Fig. 5 the limit of movement in either direction may be accurately predetermined by adjustment of the blocks at the desired predetermined points.

The slide block 64, which constitutes a supporting head for a swivel block and slide, presently to be more fully described, is circular in plan except at the rear where it is provided with a flat peripheral surface 90 which registers with the flat rear surface of the slide block 37 in the normal zero position indicated in Fig. 6. A shouldered bearing opening 91 is provided in the block 64 beneath the dovetail slide rib 62 and at the under side of the block, and concentric to the opening 91 there is provided a circular bearing rib 92. A swivel block 93 is mounted beneath the slide block 64 by means of a central stud 94 screwed therein and having a shouldered head 95 rotatably disposed in the opening 91, a circular groove 96 being provided in the upper surface of the swivel block 93 in concentric relation to the stud 94 and engaged by the circular bearing rib 92. The swivel block 93 is of corresponding shape to the slide block 64 and at its outer forward is adapted to be rotated through rotating, of the sliding tool carrier mounted beneath it, and as will presently more fully appear.

A set screw 97, Figs. 1 and 6, is provided in radial relation in the swivel block 93 and is adapted to be tightened against the circular hearing rib 92 to thereby fix the position of the swivel block. Calibrations 98 are provided about the upper peripheral portion of the block 64 throughout the range of rotary adjustment, a pointer extension 99 on the pointer block 85 being dis= posed in relation to these calibrations, and being shown in Figs. 1 and 5 at the zero position.

A T-slot is provided in the periphery of the swivel block beneath the calibrations 98: and is provided at each end with entrance enlargements 101 and 102 for the engagement therein of stop blocks 103 and 104 adapted to be slidably adjusted inthe slots and secured in adjusted positions by slide bolts 105 and 106. Angular cutouts 107 and 108, each of a depth corresponding to half the width of the pointer 99; are provided in the opposed faces of the blocks 103 and 104 and when brought into meeting relation abut the pointer to thereby prevent movement of the swivel block in either direction relative to the slide block 64. The adjustment of these stop blocks ateach side of the zero position shown in Figs. 1, 5 and 6 predetermines the extent to which the swivel block may be rotated.

, The swivel block 93 is provided at its under side with a dovetail slide rib 109 disposed parallel to the slide rib 36 of the slide block 37 in the zero position, and which is engaged in a dovetail slideway recess 110 provided in the upper surface of the rectangular mounting slide block portion 111 of the tool carrying arm 112 for the resurfacing tool. A gib strip 113 is disposed between the bevel faces at one side of the rib 109 and recess 110, and is adapted to be tightened against the rib by means of a pair of set screws 111 and 112 to fix the position of the slide.

A longitudinal pocket 114 is provided in the block 111 within the recess 110, in which is disposed an adjustable screw shaft 115 engaging the threaded passage of a projecting boss 116 on the rib 109, one end of the screw shaft being journaled in a bearing portion 117 in one end of the pocket 114 and held against longitudinal movement by a thrust collar 118, the outer projecting end of the shaft having a cap 119 secured thereon by a pin 120 and provided with a squared projecting end portion 121 for engagement by the crank handle 49. Turning of the shaft 115 imparts movement to the arm 112 transversely of the swivel block 64, such movement being permitted when the set screws 112 and 113 are loosened. A pointer 122 is secured upon the block 111 in relation to calibrations 123 on the cap 119 to indicate the degree of turning of the shaft 115. A pointer 124 secured to the projecting under side of the swivel block 93 is disposed in relation to calibrations 125 provided upon one side of the slide block 111 and indicates the transverse movement of this slide block relatively to the swivel block.

The arm 112 which is suitably ribbed for reinforcement and is arcuate in shape, and in its normal position extends about the periphery of the grinding wheel in spaced relation thereto. At its lower end it is provided with a tubular split clamp portion 126 having a pair of depending lugs 127 and 128 engaged by a tightening screw 129 to clamp the shaft 130 of the diamond pointed or other type of resurfacing tool therein. The axis of the clamp portion 126 and of the tool 130 is in a horizontal line passing through the axis of the grinding wheel and in the zero position is in the central plane of rotation of the wheel.

A radially projecting handle 131 is provided out the outer forward corner of the slide block 111 for the purpose of manually rotating the swivel block 93 and the slide 111 and tool carrying arm 112 supported thereby.

The tool may be longitudinally adjusted by loosening the screw 129 and a suitable gauge, indicated at 132 by dot-and-dash lines, may be employed to accurately position the tool, the gauge being removed, of course, during the resurfacing operation. The calibrations, it will be understood, may be suitably numbered at each side of the zero point, the zero point for the several calibrations being shown in the drawings, Figs. 1, 2 and 6, in register with the respective pointers. For the sake of clearness the actual numerals are not illustrated.

The operation is as follows:

It will be assumed for example that an emery ,wheel having the shape shown in Fig. 8 is to be shaped or resurfaced. All of the slides are set at zero, that is with the index pointers at the centers of all of the calibrations. The top slide 14 operated by the handle 22 is adapted to have relatively fast movement and is used to move the resurfacing device into and out of operative relation, and when located in its operative position at zero on the calibrations 24 it is fixed in place by tightening the set-screws 17. This slide is also used for dressing the sides of the emery wheel where a quick in and out feed may be utilized, and for other operations of the resurfacing tool as will be obvious.

With the several slides at zero, in which case the diamond point is directly in the center line 2-2 of Fig. 1, the point is first faced across the line A-A on both sides of the emery wheel, and

then returned to the center line B--B by operation of the cross slide 64, the handle 49 being applied to the end 76 of the screw shaft 169 for this purpose.

To form the A; inch radius C the tool is first moved away from the periphery of the emery wheel along the line B-B, by operation of the top slide 14, to avoid striking the emery wheel with the diamond point while setting for the radius. Slide 111 is now moved outwardly inch by turning the screw shaft 115 the handle 49 being engaged with the shaft end 121. This brings the diamond point inch out from the swiveling center of the swivel block 93 to form the convex radius. Slide 14 is next moved gradually inwardly and at the same time the swivel block is oscillated by means of the handle 131 tothe desired degree at each side of the center, until the slide 14 is brought to its zero position completing the radius C. The desired degree of oscillation of the swivel block is predetermined by setting the stop blocks 103 and 104 at each side of the index pointer 99.

To form the radius D slide 14 is moved outwardly to bring the tool away from the emery wheel and slide 111 is moved inwardly 4inch from the zero position so that the diamond point is set for forming a inch concave radius. The cross slide 64 is now moved by operation of the screw shaft 69 to bring the swivel center to the left of the center line BB and in line with the radius center of the radius C. Slide 37 is now brought inward to the required position to coincide the swivel center with the radius center. Slide 14 is next brought inwardly to zero position and the swivel block oscillated to form the radius D, the stops 103 and 104 being set at the required limits.

To form the A; inch radius E slide 14 is moved out, and slides 111, 64 and 37 are all set at zero. Slide 111 is then moved outwardly inch for a inch convex radius. The cross slide 64 is now operated away from the zero position to the left and the slide 14 is moved inwardly to zero position and fixed in place. The cross slide 64 is now operated toward zero position and at the same time the swivel block is oscillated, completing the inch convex radius E when the zero position of the cross slide is reached. The stops 103 and 104 are set to the proper number of degrees to prevent striking the concave radius D or removing too much on the wheel for the forming of the $4 inch concave radius F, which will be formed in a similar manner to the forming of the radius D.

To form the 30 angular surface G the block 29 is set by first loosening the bolt 32 and turning the block on thehead so that it is at a right angle to the angular surface, the block 29 is secured in its adjusted position by tightening the bolt 32, and thereupon the cross slide 64 is operated to face the surface G.

The surface D E F and G at the other side are resurfaced in the same way, as will be obvious.

It will be seen that various shaped surfaces may be accurately blended into each other without any perceptible division lines between them.

While I have shown only one shape of emery wheel, by way of example, it will be obvious from the above description that any desired shapes may be formed and resurfaced with utmost ac-' curacy, and that by following a record of the settings, exact shapes may be reproduced. This is particularly important in the making of sectional dies, gear blanking punches and dies, and in many other types of work where great accuracy is essential.

By removing the screw 32 the device may be readily removed when desired, without disturbing the supporting arm 13, and, as shown in Fig. 4, it may be mounted on the bed of the grinding machine by means of a magnetic chuck or other suitable means. In the case illustrated the device is in position for resurfacing a high speed emery wheel attachment.

I have illustrated and described a preferred and satisfactory embodiment of the invention, but it will be obvious that changes may be made therein, within the spirit and scope thereof, as defined in the appended claims.

Having thus described my invention what I claim and desire to secure by Letters Patent is:

1. In a surfacing device for grinding wheels or the like, a slide movable rectilinearly, adjustable means adapted to limit the movement of said slide in either direction with respect to a given point, a slide movable transversely of the rectilinear "movement of said first slide, adjustable means adapted to limit the movement of said transversely movable slide in either direction with respect to a given zero point, a support carried by said slides and rotatable about a vertical axis through an arc in excess of 180, a slide carried by said rotatable support having rectilinear movement along a line intersecting said vertical axis and rotatable therewith, and a tool carried by said last mentioned slide and adapted to be adjusted horizontally toeither side of said vertical axis by movement of said slide.

2. In .a surfacing device for grinding wheels or the like, a slide movable rectilinearly, adjustable means adapted to limit the'movement of said slide in either direction with respect to a given point, a slide movable transversely of the rectilinear movement of said. first slide, adjustable means adapted to limit the movement of said transversely movable slide in either directionwith respect to a given zero point, a support carried by said slides and rotatable about a vertical axis through an arc in excess of 180, adjustable means adapted to limit the movement of said support in either direction with respect to a given zero point,.a slide carried by said rotatable support having rectilinear movement along a line intersecting said vertical axis and rotatable therewith and adapted to be adjusted horizontally in either directionwith respect to a zero point, said zero point being conincident with said vertical axis, a depending arm on said last mentioned slide extending rearwardly of said vertical axis, a tool carried by said arm and adapted to be adjusted horizontally toeither side of said vertical axis by movement of said slide.

3. In a surfacing device for grinding wheels or the like, a support adapted for attachment to a grinding machine, a pivot block having rotary adjustment on said support about a vertical axis, a rotatable support carried by said pivot block and rotatable through an arc in excess of 180 about a vertical axis normally coaxial with said first vertical axis, means for adjusting said rotatable support horizontally relatively to said pivot block, a slide carried by said rotatable support, a tool carried by said slide and adapted to be adjusted relatively to said vertical axis of said rotatable support by movement of said slide, and adjustable means for limiting the rotation of said rotatable support to predetermined angular movements.

4. In a surfacing device for grinding wheels or .the like, a horizontally movable slide adapted for attachment to a grinding machine, a pivot block carried thereby having rotary adjustment about a vertical axis, a rotatable support carried by said pivot block and rotatable through an arc in excess of 180 about a vertical 'axis normally coaxial with said first vertical axis, means for adjusting said rotatable support horizontally relatively to said pivot block, a slide carried by said 

